Coupling for rubber covered tubes



Nov. 27, 1934. A. L PARKER 1,982,533

COUPLING FOR RUBBER COVERED TUBES Filed. Nov. 14, 1951 7 I} nnentor /4%W (WA/2w;

Gttorneg provements in a coup metal tube wherein th attached to the metal tu ubber covering is firmly pling for a rubberend portion of the ering therefor may be flr pling and a very ti covered tube In the drawingwith the rubber-covered tube joined to the cou- Fig. 2 is a view showin coupling member havin seat with the endsof th ber covering flared the same to the coupling members;

g the outwardly tapered coupling showing a sli and attaching means therefor.

Patented Nov. 27, 1934 1,982,538 COUPLING FOB RUBBER COVERED TUBES Arthur L. Parker, Cleveland, Ohio Application November 14, 1931, Serial No. 575,064 2 Claims. (Cl. 285-86) UNITED STATES PATENT OFFICE I The invention relates to new and useful imtube after which the end of the tube is flared to ling for a rubber-covered conform to the taper of the seat on the encircling coupling member. The two coupling members b are then attached and flrmly clamp the flared end An object of the invention is to provide a couof the metal tube, the rubber covering and the '0 covered metal tubewherein the sleeve, thus making a very tight Joint between the metal tube and the rubber covrubber-covered tube and the coupling.

mly united with the cou- Referring more in detail to the drawing, the ght joint produced between rubber-covered tube, in its preferred form, as

and the coupling parts. shown in Fig. 3, consists of an inner metal tube 1 of any suitable light metal which Figure 1 is a sectional view showing a coupling rally wound on this metal tube 1 ric 2 which is firmly cemented t is flexible. Spiis a strip of fabo the metal tube.

g the assembling of the fabric-covered metal tube and c This construction of rubberemetal tube and the rubforms no part of the presen preparatory to the joining of shown, described and claime The preferred form of coupling for the rub- Fig. 4 is a vertical sectional view through a ber tube is shown in Figures 1 and 2. The coughtly modified form of coupling consists of a female metal member 4 which is provided with a thread 5 and with a tapered Fig. 5 is a view similar to Fig. 4, but showing a seat 6. This female member is adapted to enslightly modified form of rubber-covered tube circle the rubber-covered metal tube 1. Associated with this female coupling member 4 is a The invention is directed to a combination of m tal sl ve r liner 7 of t n tu ular stock; features which produces a very efficient coupling either bra pp r duralumin i P f dfor attachment to a rubber-covered tube. The The ne vfi 7 iS pl c d in t e female courubber-covered tube is preferably formed of an plin m mber and is flared at 8 so as to conform inner metal tube of comparatively light metal to the seat 6 before the coupling member is placed which is strong and flexible, a fabric covering over the tube. The outer end of this sleeve or which is cemented to the metal tube, and a preliner 7 may be bent outwardly at 9 so as to join formed rubber tube covering which contacts with the liner or sleeve to the coupling member as a emented thereto. covered metal tube t invention, but is d, together with the method of making the same, in my co-pending Fig. 3 is a side view with parts broken away application Serial No. 573,679, filed November 7, showing the construction of the preferred form 1931. of rubber-covered metal tube;

the fabric covering and is cemented thereto. The rubber covering extends all the way to the end of the tube. This rubber-covered tube is joined to a coupling which consists of a member which encircles the rubber-covered tube and has a tapered seat at the end thereof adjacent the end of the tube. This coupling member is threaded into another coupling member which has a tapered seat adapted to extend into the end of the metal tube. In the preferred form of coupling there is a metallic sleeve placed within the coupling member which is to encircle the tube, and this sleeve is tapered so as to conform to a tapered sleeve on the coupling member with which it is associated. The other end of the sleeve may be bent. if desired, so as to retain the sleeve within the coupling member whereby they may be handled as a unit. This coupling member with its associated sleeve is placed on the end of the rubber unit for handling and assembling the parts.

Cooperating with the female member of the coupling is a male member 10 which is provided with a threaded portion 11 and a tapered seat 12. The tapered seat 12 is preferably of a spherical shape. The female member with its associated sleeve is slipped on to the rubber-covered metal tube as indicated in Fig. 2, after which the end of the tube is flared, preferably with a hammer type flaring tool, which serves as a die, thus shaping the flared end of the rubber-covered tube so as to conform to the seats on the coupling member. After the tube end has been flared, then the coupling parts are threaded together and the seat 6 on the female member will flrmly engage the outer face of the sleeve or liner 7, while the inner face 13 of the flared end of the metal tube 1 will contact with the seat 12 on the male coupling member. The end 14 of the female coupling member contacts with a shoulder on the male member and limits the threading movement of the female member on to themale member. By this arrangement, the proper compression of the rubber tube at the forward end thereof is attained, and there is no danger of the mechanic forcing the rubber from between the metallic surfaces through excessive turning of the coupling members. Furthermore, the coupling parts are securely locked together so as to resist vibration separating the same. when the flared end of the rubber-covered tube is flrmly clamped with a protecting rubber cushion between the clamping seats of the coupling members, a tight joint is maintained and the parts are securely held, even under excessive vibration in the tube parts. The sleeve or liner 7 not only serves as a clamping member, but it reduces the natural friction between the female coupling member 4 and the rubber covering of the tube. This provides metallic surfaces with metallic friction contact during the joining of the coupling members to the tube, rather than a friction between rubber and metal.

In Fig. 4 of the drawing, the coupling member 16 which encircles the tube is the male member and is threaded into the female member 1'7. The male member has a tapered seat 18 engaging the outer tapered face of the sleeve or liner '7 and the female member 1'1 has. a tapered face 19 engaging the inner face of the flared end of the metal tube 1. The outer end of the liner '7 is bent so as to secure the same to the male coupling member as a unit. The parts are assembled in precisely the manner described above.

In Fig. 5 of the drawing, coupling members are shown similar to those in Fig. 4. In this form of the invention, the metal tube-1 is provided with a rubber covering 3. There is no sleeve or liner used, but the male coupling member 16 has its tapered seam 18 directly in contact with the outer face of the rubber covering for the metal tube. The seat 19 on the female member 1'7 engages the inner face of the flared end of the metal tube 1. In the coupling shown in Figures 4 and 5, there is a shoulder 20 on the male coupling member 16 which engages the end 21 of the female coupling member and limits the threading movement of one coupling member into the other. The coupling members are so proportioned that the rubber covering is not forced from between the seats, but is firmly clamped between the seats and retained so as to form a tight joint and a cushioned joint for uniting the tube coupling members. 1

It will be understood that the coupling memsential, however, that there shall be tapered seats clamping the flared end of the rubber-covered tube, and that there shall be cooperating stops which limit the turning of the coupling members when they are threaded together. It will also be obvious that other forms of rubbercovered metal tubes may be used and efflciently joined to my improved coupling.

Having thus described the invention, what I claim as new and desire to secure by Letters- Patent, is-

1. The combination of a metal inner tube, a rubber covering therefor firmly joined thereto and extending throughout the length of the tube,

said tube and rubber. covering having the end thereof flared outwardly, a metal coupling member having a tapered seat extending within and bearing on the tapered end of the inner tube, a metal coupling member surrounding the rubber tube and having a tapered seat'adapted to exert a pressure against the outer surface of the flared end of the rubber covering for the metal tube, said coupling members having a threaded connection whereby the flared end of the rubber covered metal tube is clamped between the seats on the coupling members, and means for limiting further movement of the threaded engagement when the flared end of the rubber covered metal tube is firmly clamped.

2. The combination of a metal inner tube, a rubber covering therefor flrmly joined thereto and extending throughout the length of the tube, said tube and rubber covering having the end thereof flared outwardly, a metal sleeve surrounding the rubber covered metal tube at the end thereof and having the outer end thereof flared outwardly to conform to the flared end of the tube, a metal coupling member having a tapered seat extending within and bearing on the tapered end of the metal inner tube, a metal coupling member surrounding the metal sleeve and having a tapered seat bearing on the outer face thereof, said coupling members having a threaded connection wherebythe flared end of the rubber covered metal tube is clamped between the seats on the coupling members, and means for limiting further movement of the threaded engagement when the flared end of the rubber covered metal tube is flrmly clamped.

ARTHUR L. PARKER. 

